EP0857940A1 - Conteneur de munition comportant des fléchettes et méthode de chargement pour untel conteneur. - Google Patents

Conteneur de munition comportant des fléchettes et méthode de chargement pour untel conteneur. Download PDF

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Publication number
EP0857940A1
EP0857940A1 EP97123005A EP97123005A EP0857940A1 EP 0857940 A1 EP0857940 A1 EP 0857940A1 EP 97123005 A EP97123005 A EP 97123005A EP 97123005 A EP97123005 A EP 97123005A EP 0857940 A1 EP0857940 A1 EP 0857940A1
Authority
EP
European Patent Office
Prior art keywords
flechettes
flechette
canister
fin
tip
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP97123005A
Other languages
German (de)
English (en)
Other versions
EP0857940B1 (fr
Inventor
John Sigler
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
General Dynamics Ordnance and Tactical Systems Inc
Original Assignee
Primex Technologies Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Primex Technologies Inc filed Critical Primex Technologies Inc
Publication of EP0857940A1 publication Critical patent/EP0857940A1/fr
Application granted granted Critical
Publication of EP0857940B1 publication Critical patent/EP0857940B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B7/00—Shotgun ammunition
    • F42B7/02—Cartridges, i.e. cases with propellant charge and missile
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B10/00—Means for influencing, e.g. improving, the aerodynamic properties of projectiles or missiles; Arrangements on projectiles or missiles for stabilising, steering, range-reducing, range-increasing or fall-retarding
    • F42B10/02—Stabilising arrangements
    • F42B10/04—Stabilising arrangements using fixed fins
    • F42B10/06—Tail fins
    • F42B10/08—Flechette-type projectiles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B12/00—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material
    • F42B12/02—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the warhead or the intended effect
    • F42B12/36—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the warhead or the intended effect for dispensing materials; for producing chemical or physical reaction; for signalling ; for transmitting information
    • F42B12/56—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the warhead or the intended effect for dispensing materials; for producing chemical or physical reaction; for signalling ; for transmitting information for dispensing discrete solid bodies
    • F42B12/58—Cluster or cargo ammunition, i.e. projectiles containing one or more submissiles
    • F42B12/62—Cluster or cargo ammunition, i.e. projectiles containing one or more submissiles the submissiles being ejected parallel to the longitudinal axis of the projectile
    • F42B12/64—Cluster or cargo ammunition, i.e. projectiles containing one or more submissiles the submissiles being ejected parallel to the longitudinal axis of the projectile the submissiles being of shot- or flechette-type
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S102/00—Ammunition and explosives
    • Y10S102/703—Flechette

Definitions

  • This invention relates to multi-flechette weapons, more particularly, this invention relates to increasing the packing density of the flechettes.
  • a common approach to anti-personnel cartridge design provides a canister projectile containing a plurality of anti-personnel flechettes.
  • Flechettes are small generally arrow shaped projectiles typically impact-formed from wire stock or struck from dies. At an end opposite a pointed end, are typically a plurality of fins, or vanes.
  • Another known technique provides a tip-to-tail configuration in which a first layer faces in the direction of flight and a second layer faces opposite to the direction of flight.
  • the tips of the second layer interleave along the tails of the first layer and the tips of the first layer interleave with the tails of the second layer resulting in a packing density greater than that of Mawhinney because the length in this second technique provides a length at least equal to the length of a flechette.
  • the tip-to-tail approach requires the backward facing flechettes to reorient themselves once expelled from the canister projectile. Observations from test firings and analytical modeling suggest that the backward facing flechettes, once starting to tumble to reorient themselves, cannot readily stop from tumbling. Additionally, computational models that include the backward facing flechettes having fins double the size of conventional fins also suggest that they would also tend to not stop tumbling.
  • a multi-flechette weapon is provided that eliminates the problems of the prior art and improves the packing density of flechettes in a flechettes canister.
  • a multi-flechette weapon including a flechette holding canister.
  • a first set of flechettes each having a tip end and a fin end with a number of fins at the fin end along with a second set of flechettes, each having a tip end and an opposite end and a plurality of fins offset from the opposite end toward the tip end.
  • the first flechettes and second flechettes are adjacent to each other in an alternating fashion with their tip ends aligned in the same direction.
  • the typical multi-flechette cartridge as known from the prior art is shown in a cross section view in Fig. 1 and is designated generally by the reference numeral 10.
  • the cartridge 10 includes a body 12, a multi-flechette canister 14 containing a plurality of flechettes 16.
  • the body 12 is cylindrical in shape and includes a base portion 18, a canister receiving portion 20, and a cavity 22.
  • the bottom portion 18 contains cavity 22 which is offset from the walls of the base portion 18 and along a longitudinal axis 24.
  • the cavity 22 is spherical in shape.
  • the walls of the canister receiving portion 20 define a cup shaped cavity 26 into which the multi-flechette canister 14 fits. Ports 28 connect the cavity 22 to the cup shaped cavity 26.
  • the canister 14 includes a canister body 30, a valve plate 32, an explosive charge 34, a spring 36, a pusher 38, an obturator 40, a retaining disk 42, a shear strip 44, a rubber band 46, and a nosecap 48.
  • the canister body 30 is cup shaped and adapted so that the closed end of the cup slides into the canister receiving cavity 26 of the body 12.
  • the valve plate 32 is also cup shaped and aligned in the same direction as the canister body 30, but the valve plate 32's cup depth is shallower than canister body 30 and the width of the valve plate 32, as measured transverse to the axis 24, is less than the width of the base 31.
  • the pusher 38 is cup shaped and aligned in the same direction as the canister body 30 and fits into the canister body 30 against an circumferentially inwardly projecting support portion 50 at the base 31.
  • the spring 36 is generally conical and sits between the pusher 38 and the valve plate 32, biasing the valve plate 32 against the base 31.
  • the canister body 30 includes a port 52 located on the axis 24 and having a diameter transverse to the axis 24 less than the diameter of the valve plate 32. Within a cavity defined by the spring 36 and the valve plate 32 is the explosive charge 34.
  • the flechettes 16 include a tip end 54, a middle portion 55, and a fin end 56 and are packed into the pusher 38 so that the fin ends 56 abut the base of the pusher 38.
  • the nose cap 48 fits against a circumferential recess 58 on the canister body 30 and covers the tip ends 54.
  • the shear strip 44 fits into a circumferential recess 60 on canister body 30 adjacent to the lower end of the nose cap 48.
  • the rubber band 46 between the nose cap 48 and the retaining disk 42 biases the retaining disk 42 against the tip ends 54.
  • the obturator 40 fits in a circumferential recess 63 on the canister body 30.
  • the canister cartridge 10 is placed in a large caliber barrel 62 as illustrated in Fig. 2(a).
  • a gaseous source 64 in cavity 22 is ignited and the gases generated pass through ports 28 into the cavity 26.
  • the gases force the canister body 30 to separate from the cartridge body 12 and travel in the direction 66 down the barrel 62 as illustrated in Fig. 2(b).
  • the gases also press against the valve plate 32 by passing through the port 52.
  • the pressure of the gases is sufficient to force the valve plate 32 away from abutting the base 31 and toward the pusher 38. When this happens, the gasses pass around the edges of the valve plate 32 and contact the explosive charge 34 causing it to ignite.
  • the ignition of the expulsion charge 34 causes the nose cap 48 to separate from the body 30 and the rubber band 46 provide the nose cap with a slight additional acceleration as compared to the pusher 38 as illustrated in Fig. 2(c).
  • the nose cap 48, the rubber band 46, and the retaining disk 42 exit the barrel 66 prior to the flechettes 16 and fall to the side as illustrated in Fig. 2(d).
  • the flechettes 16 continue to their target (not shown) while the remainder of the components exit the barrel 62 and fall to the ground.
  • the packing density of the flechettes 16 according to the typical cartridge 10 as previously known and described above suffers because the fin ends 56 of adjacent flechettes 16 abut but do not interleave such that a middle portion 55 of adjacent flechettes 16 abut. Thus, where adjacent middle portions 55 do not abut results in wasted space.
  • One attempt to increase the packing density as illustrated in Fig. 3 provides for one half of the flechettes 16 with their tip ends 54 aligned in the direction of travel 66 and one half of the flechettes 16 aligned with their tip ends 54 opposite to the direction of travel 66, resulting in a tip-to-tail packing configuration.
  • Fig. 4 illustrates a velocity profile 68 for a tumbling flechette and a velocity profile 69 for a non-tumbling flechette with range on the x-axis in feet and velocity on the y-axis in feet per second. The Fig. 4 shows that a tumbling flechette loses velocity more quickly than a non-tumbling flechette and travels less far.
  • Fig. 5 illustrates a known flechette 16.
  • the fin end 56 includes a plurality of fins 70.
  • the number of fins depends on the desired aerodynamic features of the flechette 16.
  • One preferred number of fins is four, each fin making a ninety degree angle with its two adjacent neighbors.
  • the shape of the fins may take on various aerodynamic shapes, one of which is illustrated in Fig. 5.
  • a length 72 of the fin 70 as measured at its maximum length along the direction of travel is from about 0.755 to about 0.795 inch.
  • the fins 70 also include a second length 74 that is the length of the fin 70 from an edge 76 of the fin end 56 to a transition portion 78 where the fins 70 transition to the middle portion 55.
  • the second length 74 is from about 0.335 inch to about 0.375 inch.
  • the flechette 16 has a length 76 from about 2.97 inches to about 2.03 inches.
  • the tip portion 54 includes a taper 80 where the middle portion 55 tapers to a point 82.
  • Fig. 6 illustrates a fin forward flechette 84 according to one embodiment of the invention.
  • the flechette 84 includes a tip end 86, a forward rod portion 88 integral to the tip end 86, a forward transition portion 90 integral to the forward rod portion 88, a fin portion 92 integral to the forward transition portion 90, an end transition portion 94 integral to the fin portion 92, end rod portion 96 integral to the end transition portion 94, and a rod end 98.
  • the tip end 86 provides a transition point from the forward rod portion 88 to a tip 100.
  • the transition may be by a plurality of surfaces 101 on the forward rod portion 88 intersecting at the tip 100 and having an angle 104 of about 9° to about 13° to a longitudinal axis 102 of the flechette 84.
  • the tip end portion could be conical in shape having an angle 104 of about 9° to about 13° to the axis 102.
  • the number of surfaces is four equally spaced around the forward rod portion 88.
  • the forward rod portion 88 has a diameter 106 transverse to the axis 102 from about 0.078 inch to about 0.084 inch, more preferably, the diameter 106 is from about 0.079 inch to about 0.083 inch.
  • the forward rod portion 88 is tubular in shape, but could include a plurality of surfaces running along its length.
  • the forward transition portion 90 provides a transition from the forward rod portion 88 to the fin portion 92.
  • the forward transition 90 portion includes a portion of the fins and a portion of the forward rod portion 88.
  • the forward rod portion 88 transitions to the fin portion 92 with a transition angle 108 from about 15° to about 25°, more preferably, the transition angle 108 is from about 18° to about 22°.
  • the fin portion 92 includes a plurality of fins 110.
  • the fins 110 are disposed symmetrically about the circumference of the flechette 84 and a portion of each fin 100 extends into the forward transition portion 90 and also the end transition portion 94.
  • the number of fins is four, but other numbers are equally preferred.
  • the fins 110 are generally concave in shape toward to the axis 102 and have a thickness 112 and a height 114 from the axis 102 to the edge of the concave shape farthest from the axis 102.
  • the fins 110 may be any aerodynamic shape, with Fig. 6 illustrating but one preferred shape.
  • the thickness 112 is from about 0.010 inch to about 0.022 inch, more preferred, the thickness 112 is from about 0.011 inch to about 0.021 inch.
  • the height 114 is from about 0.07 inch to about 0.13 inch, more preferably, the height 114 is from about 0.085 inch 0.115 inch.
  • the fin portion 92 has a length 116 along the axis 102 from about 0.30 inch to about .40 inch, more preferably, the length 116 is from about 0.33 inch to about 0.37 inch.
  • a pair of fins 110 preferably exhibits a minimum area of 0.0525 square inch.
  • the end transition portion 90 provides a transition from the fin portion 92 to the rod end portion 96.
  • the transition portion 90 includes a portion of the fins 110 and a portion of the end rod portion 96.
  • the end rod portion 90 transitions from the fin portion 92 with a transition angle 118 from about 15° to about 25°, more preferably, the transition angle 118 is from about 18° to about 22°.
  • the end rod portion 96 has a diameter 120 transverse to the axis 102 from about 0.078 inch to about 0.084 inch, more preferably, the diameter 120 is from about 0.079 inch to about 0.083 inch.
  • the end rod portion 96 is tubular in shape, but could include a plurality of surfaces running along its length.
  • a length 124 along the axis 102 includes the length of the rod end portion 96 and the end transition portion 94 and is from about 0.47 inch to about 0.52 inch, more preferably, the length 124 is from about 0.48 inch to about 0.50 inch.
  • the flechette 84 has a total length 126 as measured along the axis 102 from about 1.95 inches to about 2.05 inches, more preferably, the length 126 is from about 1.97 inches to about 2.03 inches.
  • the flechette 84 may be made from various materials including hardened steel alloys, steel wire, carbon, cold-heading quality, annealed or sperodized annealed in process, grade 1038 UNS G10380, being preferred.
  • Fig. 7 illustrates a packing according to one embodiment of the invention of a multi-flechette canister 126 containing a plurality of flechettes 16 and a plurality of flechettes 84.
  • a flechette holding canister 126 includes a plurality of flechettes 16, each having a tip end 54 and a fin end 56 with a plurality of integral fins 70 at the fin end 56 and a plurality of fin forward flechettes 84, each having a tip portion 86, an end portion 96, and a plurality of integral fins 110 offset from the rod end 98 toward the tip portion 86, wherein the flechettes 16 and fin forward flechettes 84 are located adjacent to each other in an alternating fashion with their tips aligned in the same direction.
  • the tip end of flechettes 16 and 84 come to a blunt end instead of a point.
  • the invention may be used in a non-lethal environment.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Apparatus Associated With Microorganisms And Enzymes (AREA)
  • Die Bonding (AREA)
  • Control And Other Processes For Unpacking Of Materials (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
  • Packaging Of Machine Parts And Wound Products (AREA)
  • Ladders (AREA)
EP97123005A 1997-02-10 1997-12-30 Conteneur de munition comportant des fléchettes et méthode de chargement pour untel conteneur. Expired - Lifetime EP0857940B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US798204 1985-11-14
US08/798,204 US5796031A (en) 1997-02-10 1997-02-10 Foward fin flechette

Publications (2)

Publication Number Publication Date
EP0857940A1 true EP0857940A1 (fr) 1998-08-12
EP0857940B1 EP0857940B1 (fr) 2002-08-21

Family

ID=25172795

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97123005A Expired - Lifetime EP0857940B1 (fr) 1997-02-10 1997-12-30 Conteneur de munition comportant des fléchettes et méthode de chargement pour untel conteneur.

Country Status (5)

Country Link
US (1) US5796031A (fr)
EP (1) EP0857940B1 (fr)
AT (1) ATE222648T1 (fr)
DE (1) DE69714834T2 (fr)
IL (1) IL122893A (fr)

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US10890422B2 (en) 2007-07-26 2021-01-12 Scarr Research and Development Co., LLC Ring airfoil glider with augmented stability

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US6598534B2 (en) * 2001-06-04 2003-07-29 Raytheon Company Warhead with aligned projectiles
US6779462B2 (en) 2001-06-04 2004-08-24 Raytheon Company Kinetic energy rod warhead with optimal penetrators
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US7624683B2 (en) 2001-08-23 2009-12-01 Raytheon Company Kinetic energy rod warhead with projectile spacing
US20050109234A1 (en) * 2001-08-23 2005-05-26 Lloyd Richard M. Kinetic energy rod warhead with lower deployment angles
US6910423B2 (en) * 2001-08-23 2005-06-28 Raytheon Company Kinetic energy rod warhead with lower deployment angles
US7624682B2 (en) * 2001-08-23 2009-12-01 Raytheon Company Kinetic energy rod warhead with lower deployment angles
US20060283348A1 (en) * 2001-08-23 2006-12-21 Lloyd Richard M Kinetic energy rod warhead with self-aligning penetrators
US7621222B2 (en) * 2001-08-23 2009-11-24 Raytheon Company Kinetic energy rod warhead with lower deployment angles
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US20060021538A1 (en) * 2002-08-29 2006-02-02 Lloyd Richard M Kinetic energy rod warhead deployment system
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US7987790B1 (en) 2003-03-18 2011-08-02 Scarr Kimball R Ring airfoil glider expendable cartridge and glider launching method
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US6920827B2 (en) * 2003-10-31 2005-07-26 Raytheon Company Vehicle-borne system and method for countering an incoming threat
US7418906B2 (en) * 2004-08-31 2008-09-02 The United States Of America As Represented By The Secretary Of The Army Dual spin canister ammunition
US7314006B1 (en) * 2004-09-30 2008-01-01 United States Of America As Represented By The Secretary Of The Army Nonlethal canister tank round
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US7690304B2 (en) * 2005-09-30 2010-04-06 Lone Star Ip Holdings, Lp Small smart weapon and weapon system employing the same
US7895946B2 (en) 2005-09-30 2011-03-01 Lone Star Ip Holdings, Lp Small smart weapon and weapon system employing the same
US7568433B1 (en) * 2006-02-22 2009-08-04 The United States Of America As Represented By The Secretary Of The Army Aerodynamically stable finless projectile
US8541724B2 (en) 2006-09-29 2013-09-24 Lone Star Ip Holdings, Lp Small smart weapon and weapon system employing the same
US8117955B2 (en) 2006-10-26 2012-02-21 Lone Star Ip Holdings, Lp Weapon interface system and delivery platform employing the same
US8707868B2 (en) * 2006-11-30 2014-04-29 The United States Of America As Represented By The Secretary Of The Navy Pre-compressed penetrator element for projectile
US7823509B2 (en) * 2007-07-20 2010-11-02 Frank J Dindl Flechette cartridge
US8065961B1 (en) 2007-09-18 2011-11-29 Kimball Rustin Scarr Less lethal ammunition
US8074572B1 (en) * 2009-03-30 2011-12-13 The United States Of America As Represented By The Secretary Of The Navy Conical dart sub-munitions for cargo round
US9068807B1 (en) * 2009-10-29 2015-06-30 Lockheed Martin Corporation Rocket-propelled grenade
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US8418623B2 (en) 2010-04-02 2013-04-16 Raytheon Company Multi-point time spacing kinetic energy rod warhead and system
US8375860B2 (en) 2010-05-05 2013-02-19 The United States Of America As Represented By The Secretary Of The Army Stackable, easily packaged and aerodynamically stable flechette
US8511232B2 (en) 2010-06-10 2013-08-20 Kimball Rustin Scarr Multifire less lethal munitions
US9140528B1 (en) 2010-11-16 2015-09-22 Lockheed Martin Corporation Covert taggant dispersing grenade
US9068803B2 (en) 2011-04-19 2015-06-30 Lone Star Ip Holdings, Lp Weapon and weapon system employing the same
US8640622B2 (en) * 2011-04-22 2014-02-04 Donald B. Eckstein Tandem nested projectile assembly
US8640623B2 (en) * 2011-04-22 2014-02-04 Donald B. Eckstein Multiple purpose tandem nested projectile
US8499694B2 (en) 2011-05-04 2013-08-06 The United States Of America As Represented By The Secretary Of The Army Two-fin stackable flechette having two-piece construction
US9255775B1 (en) * 2012-05-22 2016-02-09 Darren Rubin Longitudinally sectioned firearms projectiles
US10670379B2 (en) 2012-05-22 2020-06-02 Darren Rubin Longitudinally sectioned firearms projectiles
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US9200876B1 (en) 2014-03-06 2015-12-01 Lockheed Martin Corporation Multiple-charge cartridge
US9719762B2 (en) * 2015-04-01 2017-08-01 Keith A. Langenbeck Cartridges and bullets

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EP0298494A2 (fr) * 1987-07-10 1989-01-11 DIEHL GMBH & CO. Partie active de sous-munition, et tête de combat à fléchettes, et fléchettes à cet effet

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US3797359A (en) 1972-08-14 1974-03-19 Me Ass Multi-flechette weapon
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10890422B2 (en) 2007-07-26 2021-01-12 Scarr Research and Development Co., LLC Ring airfoil glider with augmented stability

Also Published As

Publication number Publication date
IL122893A0 (en) 1998-08-16
US5796031A (en) 1998-08-18
IL122893A (en) 2000-12-06
DE69714834T2 (de) 2003-04-10
DE69714834D1 (de) 2002-09-26
ATE222648T1 (de) 2002-09-15
EP0857940B1 (fr) 2002-08-21

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